Canvas flip/rotate effect for a preview

[Shirsh]

Hello Dacap, maybe you can implement this for a preview window?
Not sure about rotate actually, but flip is useful to check symmetry or how animation will work when flipped. Problem is that when I select and move some group of pixel, to watch and think, how will new placement work, when I flip canvas it flips selection only first, require to unselect etc and takes more time. If it's not too hard to implement, function similiar to "play animation in preview only" could be useful.

[WH|Raven]

I agree.

Either a button to flip the preview on the horizontal axis or an extra preview window (f.e. a "Mirrored Preview") so both could be visible at once would be great.

It's commonly used to check that your proportions and symmetry is correct when drawing. (helps to spot errors easily)

[dacap]

I've just added this issue on GitHub: https://github.com/aseprite/aseprite/issues/1225 (planned for v1.2)